The instrument used to measure relative humidity is a

• A. Hygrometer
• B. Barometer
• C. Hydrometer
• D. Manometer

Audu is taller than Laide but shorter than Deji. Deji is of the same height as Taiwo.Who is the shortest?

• A. Audu
• B. Laide
• C. Deji
• D. Taiwo

The central theme of Paul’s letter to Philemon is

• A. The liberty of the Christian under the law
• B. Concern for the welfare of the slaves
• C. The bulling of one another
• D. The forgiveness of one another

Excess water in plants is excreted as water vapour and droplets respectively through

• A. respiration and guttation
• B. transpiration and guttation
• C. photosynthesis and guttation
• D. guttation and condensation

In a basket, there are 6 grapes, 11 bananas and 13 oranges. If one fruit is chosen at random. What is the probability that the fruit is either a grape or a banana

• A. 6/30
• B. 5/30
• C. 17/30
• D. 11/30

From the words lettered A to D below each of the following sentences, choose the word that is opposite in meaning to the underlined word.

Mrs. Apata is always moody while her husband is for ever.........

• A. cheerful
• B. willing
• C. tender
• D. loving E. petulant

(a) Define the following terms:(i) Saturated solution; (ii) Solubility.

(b) In an experiment to determine the solubility of a given salt Y, the following data were provided:

Mass of dry empty dish = 7.16 g

Mass of dish + saturated solution of salt Y = 17.85 g

Mass of dish + salt Y = 9.30 g Temperature of solution = °C

Molar mass of salt Y = 100

Density of solution Y = 1.00 g cm\(^{-3}\) Calculate the solubility of salt Y in

(i) g dm\(^{-3}\) of solution, (ii) mol dm\(^{-3}\) of solution.

(c) State the type of bond broken on melting each of the following substances: (i) NaCI\(_{(s)}\) (ii) CO\(_{2(s)}\) (iii) SiO\(_{2(s)}\) (iv) Al\(_{(s)}\)

(d) Explain the following observations: (i) the chemical reactivity of alkali metals increases down the group; (ii) Mg has higher melting point than Na; (iii) K is a better reducing agent than Na.

(e)(i) What are isotopes? (ii) Lithium exists as \(^6_3\)Li and \(^7_3\)Li in the ratio 2:25. Calculate the relative atomic mass of the lithium.

Which of the following pairs are characteristics of igneous rocks? They I. are stratified II are metamorphosed rocks III. are crystalline IV. originate from molten magma

• A. I and II only
• B. II and III only
• C. II and IV only
• D. IIl and IV only

Flourescent tubes produces light by the

• A. excitation of gas molecules
• B. conduction of solar energy
• C. refraction of light by gas molecules
• D. thermal agitation of electron in the tubes

Which of the following is a type of wave that is both mechanical and longitudinal?

• A. Water waves
• B. Seismic waves
• C. Sound waves
• D. Light waves